Scrap aluminum contains heavy metals such as copper. These metals are heavily polluted by oil contamination. It is difficult to separate heavy metals from waste aluminum by manual sorting. From the data reported at home and abroad, the research program mainly has the following aspects:
(1) Heavy medium mineral processing
In other words, heavy medium non-ferrous metals such as copper with a density greater than that of aluminum are sorted by means of heavy medium re-selection, which utilizes the principle that the density of aluminum is smaller than that of other heavy nonferrous metals, so that the aluminum waste floats on the medium while heavy non-ferrous metals sink. The bottom, to achieve the purpose of separation. But the key to technology is to screen a medium that has a density greater than aluminum but less than copper. This medium is by no means water or other liquids, certainly a fluid. When working, the fluid is reciprocating and aluminum scrap is separated on the medium.
(2) Parabolic ore dressing
By using the principle that different objects with substantially the same volume are different when the same force is thrown, various waste non-ferrous metals with different densities in the waste aluminum can be separated. When objects of different densities and substantially the same volume are ejected along a straight line with the same force, various objects move in the direction of the parabola and fall at different points when landing. The simplest experiment can be carried out on a horizontal conveyor belt. When the mixed waste material runs at a high speed along the conveyor belt on the conveyor belt, when it runs to the end, the waste aluminum alloy is thrown along the straight line, due to the different gravity of various wastes. Different points were dropped to achieve the purpose of sorting waste aluminum. This method can evenly separate waste aluminum, copper scrap, lead waste and other wastes. Equipment manufactured under this principle has been adopted abroad and is currently in the research stage in China.
Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
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